WO2024161532A1 - Rotation device - Google Patents

Abstract

The present invention provides a rotation device in which the rigidness of an intermediate cylindrical part is improved.　Provided is a rotation device (1) in which an inner cylindrical part (10), an intermediate cylindrical part (20), and an outer cylindrical part (30) are disposed concentrically and are centered about a rotation shaft (40), wherein: the intermediate cylindrical part is provided with an annular part (23) in which pole pieces and spacers that are each constituted by continuous bodies along the rotation shaft are disposed alternatingly in the circumferential direction, and a reinforcing ring (24) which supports the annular part; the reinforcing ring is disposed on the inner diameter side of the annular part; and an outer circumferential surface of the reinforcing ring is fastened to an inner circumferential surface of the spacer.

Description

Rotating device

This application relates to a rotating device.

A rotating device having a triple cylindrical structure in which an inner cylindrical portion, an intermediate cylindrical portion, and an outer cylindrical portion are arranged concentrically is known. In such a rotating device, the three cylindrical portions each function as a stator or a rotor. For example, a rotating device in which the intermediate cylindrical portion serves as a stator and the inner cylindrical portion and the outer cylindrical portion serve as rotors is called a magnetic gear device. In the magnetic gear device, rotational torque is transmitted between the inner cylindrical portion and the outer cylindrical portion via the intermediate cylindrical portion provided with magnetic pole pieces. For this reason, the magnetic gear device is applied to, for example, speed increasers for wind power generation devices and automobile transmissions. In addition, a rotating device in which the outer cylindrical portion serves as a stator and the inner cylindrical portion and the intermediate cylindrical portion serve as rotors is called a magnetic geared rotating electric machine. In a magnetic geared rotating electric machine, when the intermediate cylindrical portion provided with magnetic pole pieces is rotated by an external power source, the inner cylindrical portion provided with a magnet rotates at a predetermined speed increase ratio. In this magnetic geared rotating electric machine, a current is generated in a coil provided in the outer cylindrical portion due to a change in magnetic flux caused by the rotation of the inner cylindrical portion. For this reason, magnetic-geared rotating electric machines are used, for example, in generators for wind power generation equipment.

In a rotating device having a triple cylindrical structure, the radial width of the intermediate cylindrical portion is reduced to strengthen the magnetic coupling between the inner cylindrical portion and the outer cylindrical portion. The intermediate cylindrical portion also has magnetic pole pieces arranged in the circumferential direction. These magnetic pole pieces are made by stacking magnetic materials such as electromagnetic steel sheets in the axial direction. In a magnetic gear device in which the intermediate cylindrical portion serves as the stator, the magnetic pole pieces of the intermediate cylindrical portion are subjected to electromagnetic forces in the radial direction as well as gravity due to their own weight. In a magnetic geared rotating electric machine in which the intermediate cylindrical portion serves as the rotor, the magnetic pole pieces of the intermediate cylindrical portion are subjected to electromagnetic forces in the radial direction as well as gravity due to their own weight and centrifugal force due to rotation. For this reason, the intermediate cylindrical portion is required to have the rigidity to prevent deformation due to the electromagnetic forces acting on the magnetic pole pieces and gravity due to their own weight.

A conventional rotating device that addresses these problems is one that includes an intermediate cylindrical section in which connecting members and pole pieces arranged alternately in the circumferential direction are fastened in the axial direction via a reinforcing ring. The reinforcing ring is connected to end plates arranged at both ends of the intermediate cylindrical section together with the connecting members by through bolts. In this rotating device, a protrusion is provided on the outer periphery of the reinforcing ring that contacts the connecting members and pole pieces from the radial outside. By providing such a protrusion, even if a centrifugal force acts radially outward on the connecting members and pole pieces, the centrifugal force can be transmitted to the end plates via the protrusion provided on the reinforcing ring. As a result, the rigidity of the intermediate cylindrical section can be increased (see, for example, Patent Document 1).

JP 2010-17029 A

However, in conventional rotating devices, when electromagnetic and centrifugal forces act on the intermediate cylindrical portion, a bending load acts on the through bolt that connects the reinforcing member and the connecting member. Therefore, when strong electromagnetic and centrifugal forces act on the intermediate cylindrical portion, there is a possibility that the intermediate cylindrical portion will be deformed by the bending load acting on the through bolt.

This application has been made to solve the above-mentioned problems, and aims to provide a rotating device with improved rigidity of the intermediate cylindrical portion.

The rotating device of the present application has an inner cylindrical portion, an intermediate cylindrical portion, and an outer cylindrical portion arranged concentrically around the rotation axis, and the intermediate cylindrical portion has an annular portion in which magnetic pole pieces and spacers composed of a continuum along the rotation axis are arranged alternately in the circumferential direction, and a reinforcing ring that supports the annular portion. The reinforcing ring is arranged on the inner diameter side of the annular portion, and the outer peripheral surface of the reinforcing ring is fastened to the inner peripheral surface of the spacer.

In the rotating device of the present application, the reinforcing ring is disposed on the inner diameter side of the annular portion, and the outer peripheral surface of the reinforcing ring is fastened to the inner peripheral surface of the spacer, thereby improving the rigidity of the intermediate cylindrical portion.

1 is a cross-sectional view of a rotation device according to a first embodiment. 1 is a cross-sectional view of a rotation device according to a first embodiment. 1 is an exploded perspective view of a rotating device according to a first embodiment; FIG. 11 is a cross-sectional view of a rotation device according to a second embodiment. FIG. 11 is a cross-sectional view of a rotation device according to a second embodiment. FIG. 11 is an exploded perspective view of a rotating device according to a second embodiment. FIG. 11 is a cross-sectional view of a rotation device according to a third embodiment. FIG. 11 is a cross-sectional view of a rotation device according to a fourth embodiment. FIG. 13 is a cross-sectional view of a rotation device according to a fifth embodiment. FIG. 13 is a cross-sectional view of a rotation device according to a sixth embodiment. FIG. 13 is a perspective view of an intermediate cylindrical portion of a rotation device according to a seventh embodiment.

Below, a rotating device according to an embodiment for carrying out the present application will be described in detail with reference to the drawings. Note that the same reference numerals in each drawing indicate the same or equivalent parts.

Embodiment 1.
1 and 2 are cross-sectional views of a rotating device according to a first embodiment. FIG. 1 is a cross-sectional view of a plane perpendicular to the rotation axis of the rotating device 1. FIG. 2 is a cross-sectional view of a plane parallel to the rotation axis of the rotating device 1. In this embodiment, the rotating device 1 is a magnetic gear device. The rotating device 1 of this embodiment includes an inner cylindrical portion 10, an intermediate cylindrical portion 20 arranged on the outer circumferential side of the inner cylindrical portion 10 with a gap therebetween, and an outer cylindrical portion 30 arranged on the outer circumferential side of the intermediate cylindrical portion 20 with a gap therebetween. The inner cylindrical portion 10, the intermediate cylindrical portion 20, and the outer cylindrical portion 30 are arranged concentrically around the rotation axis 40. Note that in FIGS. 1 and 2, a case for housing the inner cylindrical portion 10, the intermediate cylindrical portion 20, and the outer cylindrical portion 30 therein is omitted.

The rotating shaft 40 is cylindrical. The direction parallel to the rotating shaft 40 is called the axial direction, the direction perpendicular to the rotating shaft 40 is called the radial direction, and the direction in which the rotating shaft rotates is called the circumferential direction. The inner diameter side is the direction approaching the rotating shaft 40 in the radial direction, and the outer diameter side is the direction moving away from the rotating shaft 40 in the radial direction.

The inner cylindrical portion 10 has an inner cylindrical core 11 and inner cylindrical magnets 12 arranged in a line in the circumferential direction on the outer circumferential surface of the inner cylindrical core 11. The inner cylindrical core 11 is fastened to a rotating shaft 40. The inner cylindrical magnets 12 are permanent magnets. Furthermore, the inner cylindrical magnets 12 have south and north poles arranged alternately in the circumferential direction and are divided in the axial direction. The inner cylindrical core 11 is made of a magnetic material, for example, electromagnetic steel sheets stacked in the axial direction.

The intermediate cylindrical portion 20 has an annular portion 23 formed by circumferentially alternatingly arranging spacers 21 and pole pieces 22, and a reinforcing ring 24 that supports the annular portion 23 from its inner peripheral surface. The intermediate cylindrical portion 20 also has end plates 25 at both axial ends. The annular portion 23 formed by the spacers 21 and pole pieces 22 is supported by the end plates 25 at both axial ends. The end plates 25 are connected to the rotating shaft 40 via bearings 26. The pole pieces 22 are made of a magnetic material, such as electromagnetic steel plates laminated in the axial direction. The spacers 21, reinforcing rings 24, and end plates 25 are made of a non-magnetic material, such as austenitic stainless steel, aluminum, or resin.

The outer cylindrical portion 30 has a cylindrical outer cylindrical core 31 and outer cylindrical magnets 32 arranged in a line in the circumferential direction on the inner peripheral surface of the outer cylindrical core 31. The outer cylindrical magnets 32 are permanent magnets. Furthermore, the outer cylindrical magnets 32 have south poles and north poles arranged alternately in the circumferential direction. The outer cylindrical core 31 is made of a magnetic material, for example, electromagnetic steel sheets stacked in the axial direction.

FIG. 3 is an exploded perspective view of the rotating device 1 of this embodiment. Note that the end plate 25 and bearing 26 of the intermediate cylindrical portion 20 are omitted in FIG. 3. In the rotating device 1 of this embodiment, the inner cylindrical magnet 12 is divided into 14 pieces in the circumferential direction and 4 pieces in the axial direction. However, the inner cylindrical magnet 12 does not necessarily have to be divided in the axial direction. In addition, the annular portion 23 of the intermediate cylindrical portion 20 is configured by alternatingly arranging the magnetic pole pieces 22, which are divided into 24 pieces in the circumferential direction, and the spacer 21, which is configured as a continuum along the rotation axis. Three reinforcing rings 24 are arranged on the inner diameter side of the annular portion 23. Furthermore, the outer cylindrical magnet 32 is divided into 18 pieces in the circumferential direction.

The rotating device 1 of this embodiment is a magnetic gear device. Therefore, the intermediate cylindrical portion 20 is a stator, and the inner cylindrical portion 10 and the outer cylindrical portion 30 are rotors. Therefore, the inner cylindrical portion 10 rotates together with the rotating shaft 40. The outer cylindrical portion 30 and the inner cylindrical portion 10 rotate relatively. The intermediate cylindrical portion 20 is fixed to a case or the like via an end plate 25. Although not shown, the outer cylindrical portion 30 is supported rotatably on the rotating shaft 40 via a bearing. For example, when the inner cylindrical portion 10 is rotated by an external power, an attractive force and a repulsive force act between the inner cylindrical magnet 12 and the outer cylindrical magnet 32 via the magnetic pole piece 22 of the intermediate cylindrical portion 20. The attractive force and the repulsive force acting between the inner cylindrical magnet 12 and the outer cylindrical magnet 32 transmit the rotational torque of the inner cylindrical portion 10 to the rotational torque of the outer cylindrical portion 30.

In the magnetic gear device, when the inner cylindrical portion 10 and the outer cylindrical portion 30 are rotating, an electromagnetic force acts radially on the intermediate cylindrical portion 20 due to the magnetic forces of the inner cylindrical magnet 12 and the outer cylindrical magnet 32. Furthermore, when the magnetic gear device is used as a speed increaser for a wind power generation device, the outer diameter of the intermediate cylindrical portion 20 is 10 m or more, and the radial thickness of the annular portion 23 is also approximately 40 mm. Therefore, the effect of gravity due to the weight of the intermediate cylindrical portion 20 cannot be ignored. As a result, the intermediate cylindrical portion 20 may be deformed by the electromagnetic force and gravity. In particular, both axial ends of the intermediate cylindrical portion 20 are fixed by end plates and are therefore not easily deformed, but the central portion in the axial direction is easily deformed radially.

In the rotating device of this embodiment, as shown in Figures 2 and 3, the reinforcing ring 24 is disposed on the inner diameter side of the annular portion 23, and the outer circumferential surface of the reinforcing ring 24 is fastened to the inner circumferential surface of the spacer 21 disposed between the pole pieces 22. In other words, the inner circumferential surface of the spacer 21, which has pole pieces 22 on both circumferential sides, is fastened to the outer circumferential surface of the reinforcing ring 24. In an intermediate cylindrical portion configured in this manner, even when electromagnetic forces and gravity act radially on the reinforcing ring 24, the circumferential stress generated in the reinforcing ring 24 is reduced, thereby improving the rigidity of the intermediate cylindrical portion.

Here, the spacer 21 is configured as a continuous body without joints from the end plate 25 at one end in the axial direction to the end plate 25 at the other end. In other words, the spacer 21 is configured as a continuous body along the rotation axis. The spacer 21 configured in this way has higher rigidity than a spacer that is divided along the axial direction and has joints, improving the rigidity of the intermediate cylindrical portion.

Regarding the radial thickness of the spacer 21, the thickness of the portion fastened to the reinforcing ring 24 may be made thicker than the thickness of the other portions. In this way, the stress generated at the fastening portion between the spacer and the reinforcing ring is reduced, and the rigidity of the intermediate cylindrical portion can be improved.

The spacer 21 and the reinforcing ring 24 are fastened using a fastening method that can transmit the radially outward load acting on the spacer 21 to the reinforcing ring 24. Fastening methods that can be used include, for example, mechanical fastening methods such as bolting, riveting, and crimping; material fastening methods such as welding, pressure welding, friction welding, and solid-state welding; and chemical fastening methods such as adhesion and vapor deposition. The spacer 21 and the reinforcing ring 24 may be an integral structure.

Here, we will explain the relationship between radial displacement δ and internal pressure P when internal pressure P is applied to a cylinder with radial thickness t, average radius r, and Young's modulus of material E. The average radius is the average of the radius of the innermost surface and the radius of the outermost surface of the cylinder. The relationship between δ and P for this cylinder is given by the following equation (1).
δ = (P×r ² )/(t×E) (1)

As shown in formula (1), the radial displacement δ is proportional to the square of the average radius r. If we assume that the radially outward load acting on the intermediate cylindrical portion corresponds to the internal pressure acting on the intermediate cylindrical portion, it can be seen that if the radial thickness of the reinforcing ring is constant, the smaller the average radius of the reinforcing ring, the smaller the radial displacement. In the rotating device of this embodiment, the average radius of the reinforcing ring 24 can be reduced by fastening the reinforcing ring 24 to the inner peripheral surface of the spacer 21. This reduces the displacement of the reinforcing ring 24, which results in an improvement in the rigidity of the intermediate cylindrical portion. Furthermore, from formula (1), if the radius of the innermost peripheral surface of the reinforcing ring 24 is further reduced, the average radius will be further reduced, which results in an improvement in the rigidity of the intermediate cylindrical portion.

As a comparative example of the rotating device of the present embodiment, consider a rotating device having an intermediate cylindrical portion in which an annular portion divided into multiple axial portions is fastened in the axial direction via reinforcing links. In this comparative rotating device, the annular portion and the reinforcing links are fastened in the axial direction by bolts or the like. In the case of this comparative rotating device, the electromagnetic force acting on the intermediate cylindrical portion acts in a direction intersecting with the fastening direction of the bolts. As a result, a bending load acts on the fastening portion. That is, in the intermediate cylindrical portion of the comparative rotating device, the direction in which the fastening force of the fastening portion acts and the direction in which the load acts are intersecting. As a result, in the comparative rotating device, the fastening force of the fastening portion is weak as a resistance force against the load.

In contrast, in the rotating device of this embodiment, the annular portion and the reinforcing link are fastened in the radial direction. Therefore, the electromagnetic force acting on the intermediate cylindrical portion acts in a direction parallel to the fastening direction. This results in a tensile load acting on the fastening portion. That is, in the intermediate cylindrical portion of the rotating device of this embodiment, the direction in which the fastening force of the fastening portion acts and the direction in which the load acts are parallel. As a result, in the rotating device of this embodiment, the fastening force of the fastening portion acts directly as a resistance force against the load, so the rigidity of the intermediate cylindrical portion can be improved. In particular, high-strength fastening methods such as bolt fastening that exert a fastening force in the axial direction are effective.

It is preferable that both axial ends of the spacer are fastened to the end plates with axial tension applied. For example, in an annular section in which the spacers and pole pieces are alternately arranged in the circumferential direction, the total axial length of the pole pieces before the end plates are attached is set to be longer than the total axial length of the spacers within the elastic deformation range of the spacers. Then, the end plates and the spacers are fastened while compressing the pole pieces with the end plates from both axial ends. The end plates and the spacers can be fastened, for example, by bolting or welding. In the intermediate cylindrical section assembled in this way, an axial compressive force acts on the pole pieces and an axial tensile force acts on the spacers. In the intermediate cylindrical section configured in this way, even in the case of pole pieces in which electromagnetic steel sheets are laminated, the laminated structure of the electromagnetic steel sheets can be maintained without adopting a special structure for maintaining the laminated structure.

As shown in FIG. 2, it is preferable that the inner diameter side end of the reinforcing ring 24 of the intermediate cylindrical portion 20 is located on the inner diameter side of the outer diameter side end of the inner cylindrical magnet 12 of the inner cylindrical portion 10. With this configuration, the gap between the inner cylindrical magnet 12 of the inner cylindrical portion 10 and the pole piece 22 of the intermediate cylindrical portion 20 is reduced, increasing the rigidity of the reinforcing ring 24 while preventing a decrease in torque conversion efficiency.

In the rotating device of this embodiment, the inner cylindrical portion, which is the rotor, is fastened to the rotating shaft. In a different configuration, the intermediate cylindrical portion, which is the stator, may be fastened to the rotating shaft, and the inner and outer cylindrical portions, which are the rotors, may be rotatably supported on the rotating shaft via bearings. In this case, the rotating shaft is fixed and does not rotate. Also, in the rotating device of this embodiment, the intermediate cylindrical portion 20 has three reinforcing rings 24, but it is sufficient if it has one or more.

Embodiment 2.
4 and 5 are cross-sectional views of a rotating device according to a second embodiment. FIG. 4 is a cross-sectional view of a plane perpendicular to the rotation axis of the rotating device 1. FIG. 5 is a cross-sectional view of a plane parallel to the rotation axis of the rotating device. In this embodiment, the rotating device 1 is a magnetic-geared rotating electric machine. The rotating device 1 of this embodiment includes an inner cylindrical portion 10, an intermediate cylindrical portion 20 arranged on the outer circumferential side of the inner cylindrical portion 10 with a gap therebetween, and an outer cylindrical portion 30 arranged on the outer circumferential side of the intermediate cylindrical portion 20 with a gap therebetween. The inner cylindrical portion 10, the intermediate cylindrical portion 20, and the outer cylindrical portion 30 are arranged concentrically around the rotation axis 40. Note that in FIGS. 4 and 5, a case for housing the inner cylindrical portion 10, the intermediate cylindrical portion 20, and the outer cylindrical portion 30 therein is omitted.

The configuration of the inner cylindrical portion 10 and the intermediate cylindrical portion 20 is the same as that of the rotating device of embodiment 1. The outer cylindrical portion 30 has a cylindrical outer cylindrical core 31, an outer cylindrical magnet 32, and an outer cylindrical coil 33. The outer cylindrical core 31 has a plurality of teeth 31a that protrude from the cylindrical core back toward the inner diameter side. Slots are formed between the teeth 31a. The outer cylindrical coil 33 is wound around the teeth 31a using these slots. The outer cylindrical magnet 32 is disposed within the slot on the inner diameter side of the outer cylindrical coil 33.

FIG. 6 is an exploded perspective view of the rotating device 1 of this embodiment. Note that the end plate 25 and the bearing 26 of the intermediate cylindrical portion 20 are omitted in FIG. 6. To avoid complication, the outer cylindrical coil 33 is also omitted in FIG. 6. In the rotating device 1 of this embodiment, the inner cylindrical magnet 12 is divided into 14 pieces in the circumferential direction and 4 pieces in the axial direction. The annular portion 23 of the intermediate cylindrical portion 20 is configured by alternately arranging the magnetic pole pieces 22, which are divided into 24 pieces in the circumferential direction, and the spacer 21, which is configured as a continuum along the rotation axis. Three reinforcing rings 24 are arranged on the inner periphery of the annular portion 23. Furthermore, 18 pieces of each of the outer cylindrical magnets 32 and the outer cylindrical coils 33 are arranged in the circumferential direction.

The rotating device 1 of this embodiment is a magnetic-geared rotating electric machine. Therefore, the outer cylindrical portion 30 is the stator, the inner cylindrical portion 10 is the high-speed rotor, and the intermediate cylindrical portion 20 is the low-speed rotor. Therefore, the inner cylindrical portion 10 rotates together with the rotating shaft 40, and the intermediate cylindrical portion 20 is rotatably supported on the rotating shaft 40 via the bearing 26. Although not shown, the outer cylindrical portion 30 is fixed to the case. For example, when the intermediate cylindrical portion 20 is rotated by an external power, attractive and repulsive forces act between the inner cylindrical magnet 12 and the outer cylindrical magnet 32 via the magnetic pole piece 22 of the intermediate cylindrical portion 20. The attractive and repulsive forces acting between the inner cylindrical magnet 12 and the outer cylindrical magnet 32 transmit the rotational torque of the intermediate cylindrical portion 20 to the rotational torque of the inner cylindrical portion 10.

In a magnetic-geared rotating electric machine, when the intermediate cylindrical portion 20 rotates, an electromagnetic force acts radially on the intermediate cylindrical portion 20 due to the magnetic forces of the inner cylindrical magnet 12 and the outer cylindrical magnet 32. A centrifugal force also acts on the intermediate cylindrical portion 20. Furthermore, if the intermediate cylindrical portion 20 is large, the effect of gravity due to its own weight cannot be ignored. As a result, the intermediate cylindrical portion 20 may be deformed by the electromagnetic force, centrifugal force, and gravity. In particular, both axial ends of the intermediate cylindrical portion 20 are fixed by end plates and therefore are not easily deformed, but the central portion in the axial direction is easily deformed radially.

In the rotating device of this embodiment, as shown in Figures 5 and 6, the reinforcing ring 24 is disposed on the inner diameter side of the annular portion 23, and the outer circumferential surface of the reinforcing ring 24 is fastened to the inner circumferential surface of the spacer 21 disposed between the pole pieces 22. In other words, the inner circumferential surface of the spacer 21, which has pole pieces 22 on both circumferential sides, is fastened to the outer circumferential surface of the reinforcing ring 24. In the intermediate cylindrical portion configured in this manner, the circumferential stress generated in the reinforcing ring 24 is reduced even when electromagnetic force, centrifugal force, and gravity act radially on the reinforcing ring 24, thereby improving the rigidity of the intermediate cylindrical portion.

In the rotating device of this embodiment, as in embodiment 1, the average radius of the reinforcing ring 24 can be reduced by fastening the reinforcing ring 24 to the inner peripheral surface of the spacer 21. This reduces the displacement of the reinforcing ring 24, which results in improved rigidity of the intermediate cylindrical portion.

Furthermore, in the rotating device of this embodiment, as in embodiment 1, the annular portion and the reinforcing link are fastened along the radial direction. Therefore, the electromagnetic force, centrifugal force, and gravity acting on the intermediate cylindrical portion act in a direction parallel to the fastening direction. As a result, a tensile load acts on the fastening portion. That is, in the intermediate cylindrical portion of the rotating device of this embodiment, the direction in which the fastening force of the fastening portion acts and the direction in which the load acts are parallel. As a result, in the rotating device of this embodiment, the fastening force of the fastening portion acts directly as a resisting force against the load, thereby improving the rigidity of the intermediate cylindrical portion.

As shown in FIG. 5, it is preferable that the inner diameter side end of the reinforcing ring 24 of the intermediate cylindrical portion 20 is located on the inner diameter side of the outer diameter side end of the inner cylindrical magnet 12 of the inner cylindrical portion 10. With this configuration, the gap between the inner cylindrical magnet 12 of the inner cylindrical portion 10 and the magnetic pole piece 22 of the intermediate cylindrical portion 20 is reduced, increasing the rigidity of the reinforcing ring 24 while preventing a decrease in rotation conversion efficiency. In the rotating device of this embodiment, the intermediate cylindrical portion 20 has three reinforcing rings 24, but it is sufficient to have one or more.

Embodiment 3.
Fig. 7 is a cross-sectional view of a rotating device according to a third embodiment. Fig. 7 is a cross-sectional view of a plane parallel to the rotation axis of the rotating device. The rotating device 1 of this embodiment will be described as a magnetic gear device. Therefore, the basic configuration of the rotating device of this embodiment is similar to the configuration of the rotating device of the first embodiment.

As shown in FIG. 7, in the rotating device 1 of this embodiment, a notch 11a is formed around the entire circumference of the inner cylindrical core 11 of the inner cylindrical portion 10. This notch 11a is formed in a position facing the reinforcing ring 24 of the intermediate cylindrical portion 20. The inner cylindrical magnet 12 is also divided into four parts in the axial direction corresponding to the notch 11a. The reinforcing ring 24 is positioned away from the inner wall of this notch 11a. Therefore, the inner diameter side end of the reinforcing ring 24 of the intermediate cylindrical portion 20 can be positioned on the inner diameter side of the outer diameter side end of the inner cylindrical core 11. As a result, the average radius of the reinforcing ring 24 can be further reduced, which results in improved rigidity of the intermediate cylindrical portion.

Furthermore, in a rotating device configured in this manner, the radial width of the reinforcing ring 24 can be further increased, thereby further increasing the rigidity of the reinforcing ring 24 itself, and as a result, the rigidity of the intermediate cylindrical portion 20 can be further improved.

In the rotating device of this embodiment, the intermediate cylindrical portion 20 has three reinforcing rings 24, but it is sufficient if it has one or more. Also, although the rotating device of this embodiment has been described as a magnetic gear device, the same effect can be obtained with a magnetic geared rotating electric machine.

Embodiment 4.
Fig. 8 is a cross-sectional view of a rotation device according to embodiment 4. Fig. 8 is a cross-sectional view of a plane parallel to the rotation axis of the rotation device. The basic configuration of the rotation device of this embodiment is similar to the configuration of the rotation device of embodiment 3.

As shown in FIG. 8, in the rotating device 1 of this embodiment, a notch 11a is formed around the entire circumference of the inner cylindrical core 11 of the inner cylindrical portion 10. This notch 11a is formed in a position facing the reinforcing ring 24 of the intermediate cylindrical portion 20. The inner cylindrical magnet 12 is also divided into four in the axial direction corresponding to the notch 11a. The reinforcing ring 24 is positioned away from the inner wall of this notch 11a. Therefore, the inner diameter side end of the reinforcing ring 24 of the intermediate cylindrical portion 20 can be positioned on the inner diameter side of the outer diameter side end of the inner cylindrical core 11. As a result, the average radius of the reinforcing ring 24 can be further reduced, which results in improved rigidity of the intermediate cylindrical portion.

In addition, in the rotating device 1 of this embodiment, the intermediate cylindrical portion 20 is provided with three reinforcing rings 24. The radial width of the reinforcing rings 24 located at the center in the axial direction is smaller than the radial width of the reinforcing rings 24 located at the end in the axial direction. Therefore, the axial mass distribution of the intermediate cylindrical portion 20 is greater at the end than at the center.

The intermediate cylindrical section 20 is fixed at both axial ends by end plates 25. Therefore, the deformation of the intermediate cylindrical section 20 due to gravity is greater in the central section in the axial direction. In the rotating device of this embodiment, the axial mass distribution of the intermediate cylindrical section 20 is smaller at the central section than at the ends, so that the deformation of the central section of the intermediate cylindrical section 20 due to gravity can be reduced.

In the rotating device of this embodiment, the intermediate cylindrical portion 20 has three reinforcing rings 24, but it may have four or more. Also, although the rotating device of this embodiment has been described as a magnetic gear device, the same effect can be obtained with a magnetic geared rotating electric machine.

Embodiment 5.
Fig. 9 is a cross-sectional view of a rotation device according to embodiment 5. Fig. 9 is a cross-sectional view of a plane parallel to the rotation axis of the rotation device. The basic configuration of the rotation device of this embodiment is similar to the configuration of the rotation device of embodiment 3.

As shown in FIG. 9, in the rotating device 1 of this embodiment, a notch 11a is formed around the entire circumference of the inner cylindrical core 11 of the inner cylindrical portion 10. This notch 11a is formed in a position facing the reinforcing ring 24 of the intermediate cylindrical portion 20. The inner cylindrical magnet 12 is also divided into four parts in the axial direction corresponding to the notch 11a. The reinforcing ring 24 is positioned away from the inner wall of this notch 11a. Therefore, the inner diameter side end of the reinforcing ring 24 of the intermediate cylindrical portion 20 can be positioned on the inner diameter side of the outer diameter side end of the inner cylindrical core 11. As a result, the average radius of the reinforcing ring 24 can be further reduced, which results in improved rigidity of the intermediate cylindrical portion.

In addition, in the rotating device 1 of this embodiment, the intermediate cylindrical portion 20 is provided with three reinforcing rings 24. If the axial distance between the reinforcing ring 24 located at the axial end side and the end plate 25 is L1, and the axial distance between the reinforcing rings 24 located at the axial center side is L2, L1 is smaller than L2. In addition, the radial width of the three reinforcing rings 24 is the same. Therefore, the axial mass distribution of the intermediate cylindrical portion 20 is greater at the end side than at the center side.

The annular portion 23 of the intermediate cylindrical portion 20 has both axial ends fixed by end plates 25. Therefore, the deformation of the intermediate cylindrical portion 20 caused by gravity is greater in the central portion in the axial direction. In the rotating device of this embodiment, the axial mass distribution of the intermediate cylindrical portion 20 is smaller in the central portion than in the end portions, so that the deformation of the central portion of the intermediate cylindrical portion 20 caused by gravity can be reduced.

In addition, by making L1 smaller than L2, the load acting on the joint between the end plate 25 and the annular portion 23 due to the mass of the annular portion 23 can be reduced. As a result, the strength reliability of the intermediate cylindrical portion 20 can be improved.

In the rotating device of this embodiment, the intermediate cylindrical portion 20 has three reinforcing rings 24, but it is sufficient if it has two or more. Also, although the rotating device of this embodiment has been described as a magnetic gear device, the same effect can be obtained with a magnetic geared rotating electric machine.

Embodiment 6.
Fig. 10 is a cross-sectional view of a rotation device according to embodiment 6. Fig. 10 is a cross-sectional view of a plane parallel to the rotation axis of the rotation device. The basic configuration of the rotation device of this embodiment is similar to the configuration of the rotation device of embodiment 3.

As shown in FIG. 10, in the rotating device 1 of this embodiment, a notch 11a is formed around the entire circumference of the inner cylindrical core 11 of the inner cylindrical portion 10. This notch 11a is formed in a position facing the reinforcing ring 24 of the intermediate cylindrical portion 20. The inner cylindrical magnet 12 is also divided into four parts in the axial direction corresponding to the notch 11a. The reinforcing ring 24 is positioned away from the inner wall of this notch 11a. Therefore, the inner diameter side end of the reinforcing ring 24 of the intermediate cylindrical portion 20 can be positioned on the inner diameter side of the outer diameter side end of the inner cylindrical core 11. As a result, the average radius of the reinforcing ring 24 can be further reduced, which results in improved rigidity of the intermediate cylindrical portion.

In addition, in the rotating device 1 of this embodiment, the axial width of the cutout portion 11a is set large enough so that the reinforcing ring 24 does not come into contact with the inner cylindrical core 11. However, if the axial width of the inner cylindrical magnet 12 is reduced to match the width of the cutout portion 11a, the torque transmission efficiency of the magnetic gear device will decrease.

In the rotating device 1 of this embodiment, the width of the axial gap between the inner cylindrical magnets 12 is made smaller than the width of the cutout portion 11a. The axial thickness of the reinforcing ring 24 is set to be smallest at the position axially opposite the inner cylindrical magnet 12.

In a rotating device configured in this manner, the axial gap between the reinforcing ring 24 and the inner cylindrical core 11 and the inner cylindrical magnet 12 can be increased, preventing contact between the reinforcing ring 24 and the inner cylindrical portion 10. In addition, since there is no need to reduce the axial width of the inner cylindrical magnet 12, a decrease in the torque transmission efficiency of the magnetic gear device can be prevented.

In the rotating device of this embodiment, the intermediate cylindrical portion 20 has three reinforcing rings 24, but it is sufficient if it has one or more. Also, although the rotating device of this embodiment has been described as a magnetic gear device, the same effect can be obtained with a magnetic geared rotating electric machine.

Furthermore, in the rotating device of embodiments 3 to 6, a notch is provided in the inner cylindrical core so that the inner diameter side end of the reinforcing ring is positioned on the inner diameter side of the outer diameter side end of the inner cylindrical core. As an alternative configuration, instead of providing a notch in the inner cylindrical core, the inner cylindrical core may be configured as a split core divided into multiple parts in the axial direction.

Embodiment 7.
Fig. 11 is a perspective view of an intermediate cylindrical portion of a rotating device according to a seventh embodiment. The basic configuration of the rotating device of this embodiment is similar to that of the rotating devices of the first to sixth embodiments. Note that the end plates and bearings of the intermediate cylindrical portion 20 are omitted in Fig. 11. The intermediate cylindrical portion 20 in this embodiment has an annular portion 23 formed by arranging spacers 21 and pole pieces 22 alternately in the circumferential direction, and a reinforcing ring 24 that supports the annular portion 23 from its inner peripheral surface.

As shown in FIG. 11, in the intermediate cylindrical portion 20 of this embodiment, the pole piece 22 is composed of a non-magnetic block 22a and a split pole piece 22b. The non-magnetic block 22a is disposed in a position where the reinforcing ring 24 and the pole piece 22 face each other. That is, the pole piece 22 is composed of a non-magnetic block 22a and a split pole piece 22b that is axially divided by the non-magnetic block 22a. The material of the non-magnetic block 22a is a material with a lower density than the material of the split pole piece 22b. The material of the non-magnetic block 22a is a non-magnetic material such as stainless steel or resin. The split pole piece 22b is, for example, laminated electromagnetic steel plates.

The non-magnetic block 22a and the reinforcing ring 24 may be fastened together by bolting, welding, or the like. Alternatively, the non-magnetic block 22a and the reinforcing ring 24 may be constructed as a single unit. Since the reinforcing ring 24 is fastened to the spacer 21, the non-magnetic block 22a may not be fastened to the reinforcing ring 24, but may be held in place by fitting with at least one of the spacer 21 and the split pole piece 22b.

In the rotating device configured in this manner, the non-magnetic block 22a is made of a material with a lower density than the split pole pieces 22b, so the intermediate cylindrical portion can be made lighter than in the rotating devices of the first to sixth embodiments. As a result, the centrifugal force and gravity acting on the intermediate cylindrical portion can be reduced. In the rotating device of this embodiment, a portion of the pole pieces 22 is made of a non-magnetic material, so the proportion of magnetic material in the pole pieces 22 is reduced. However, the non-magnetic material is located opposite the reinforcing ring, and the magnetic material is located opposite the inner cylindrical magnet. In other words, there is always a magnetic material in the intermediate cylindrical portion opposite the inner cylindrical magnet. Therefore, in the rotating device of this embodiment, the torque transmission efficiency does not decrease.

Although the present application describes various exemplary embodiments, the various features, aspects, and functions described in one or more embodiments are not limited to application to a particular embodiment, but may be applied to the embodiments alone or in various combinations.
Therefore, countless modifications not exemplified are assumed within the scope of the technology disclosed in the present application, including, for example, modifying, adding, or omitting at least one component, and further, extracting at least one component and combining it with a component of another embodiment.

1 Rotating device, 10 Inner cylindrical portion, 11 Inner cylindrical core, 11a Cutout portion, 12 Inner cylindrical magnet, 20 Intermediate cylindrical portion, 21 Spacer, 22 Pole piece, 22a Non-magnetic block, 22b Split pole piece, 23 Annular portion, 24 Reinforcing ring, 25 End plate, 26 Bearing, 30 Outer cylindrical portion, 31 Outer cylindrical core, 31a Teeth, 32 Outer cylindrical magnet, 33 Outer cylindrical coil, 40 Rotating shaft.

Claims (12)

A rotating device having an inner cylindrical portion, an intermediate cylindrical portion, and an outer cylindrical portion concentrically arranged around a rotation axis,
The rotating device is characterized in that the intermediate cylindrical portion comprises an annular portion in which magnetic pole pieces and spacers composed of a continuum along the rotation axis are arranged alternately in the circumferential direction, and a reinforcing ring that supports the annular portion, the reinforcing ring being arranged on the inner diameter side of the annular portion, and the outer peripheral surface of the reinforcing ring being fastened to the inner peripheral surface of the spacer. The rotating device according to claim 1, characterized in that the inner cylindrical portion has a cylindrical inner cylindrical core and a plurality of inner cylindrical magnets arranged in a circumferential direction on the outer peripheral surface of the inner cylindrical core. The rotating device according to claim 2, characterized in that the inner cylindrical magnets are divided into multiple parts in the axial direction. The rotating device according to claim 3, characterized in that the inner diameter end of the reinforcing ring is located on the inner diameter side of the outer diameter end of the inner cylindrical magnet. The rotating device according to claim 3, characterized in that the inner diameter end of the reinforcing ring is located on the inner diameter side of the outer diameter end of the inner cylindrical core. The rotating device according to claim 4 or 5, characterized in that the axial thickness of the reinforcing ring is smallest at a position axially facing the inner cylindrical magnet. The rotating device according to any one of claims 1 to 6, characterized in that the intermediate cylindrical portion has two or more reinforcing rings, end plates are arranged at both axial ends of the intermediate cylindrical portion, and the axial distance between the end plates and the reinforcing ring closest to the end plates is smaller than the axial distance between the two reinforcing rings located at the center in the axial direction. The rotating device according to any one of claims 1 to 7, characterized in that the intermediate cylindrical portion has three or more reinforcing rings, and the radial width of the reinforcing ring located at the center in the axial direction is smaller than the radial width of the reinforcing ring located at the end in the axial direction. The rotating device according to any one of claims 1 to 8, characterized in that the magnetic pole piece of the intermediate cylindrical portion is composed of a non-magnetic block arranged in a position facing the outer circumferential surface of the reinforcing ring, and a plurality of split magnetic pole pieces separated in the axial direction by the non-magnetic block. The rotating device according to any one of claims 1 to 9, characterized in that the outer cylindrical portion has a magnet and an outer cylindrical core made of a magnetic material. The rotating device according to any one of claims 1 to 10, wherein the intermediate cylindrical portion is a stator, and the outer cylindrical portion and the inner cylindrical portion are rotors that rotate relative to each other and function as a magnetic gear device. The rotating device according to any one of claims 1 to 10, characterized in that the outer cylindrical portion includes a coil, the outer cylindrical portion is a stator, the intermediate cylindrical portion is a low-speed rotor, and the inner cylindrical portion is a high-speed rotor, and operates as a magnetic-geared rotating electric machine.

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